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FBP FieldBusPlugTechnical Description

V6

MODBUS-RTU FieldBusPlug

MRP21-FBP

MODBUS-RTU

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MRP21-FBP MODBUS-RTU FieldBusPlug

Technical Description

FieldBusPlug / Issue: 03.2010

V 6

Please note the following

Target group

This description is intended for the use of trained specialists in electrical installation and control and auto-mation engineering, who are familiar with the applicable national standards.

Safety requirements

The responsible staff must ensure that the application or use of the products described satisfy all the

requirements for safety, including all the relevant laws, regulations, guidelines and standards.

What is new in this version? available from device version

Description of new commands to read-back the baud rate and thebinary and analog output data added.

Index f

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Content

Introduction ..............................................................................................................................................5

Hardware installation guide ......................................................................................................................8

Software implementation of the FieldBusPlug .......................................................................................20

How to build an application program .....................................................................................................43

Maintenance ...........................................................................................................................................49

Technical data ........................................................................................................................................51

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Index of figures

Figure 1: MODBUS FieldBusPlug.......................................................................................................5

Figure 2: Principle serial bus infrastructure ........................................................................................8Figure 3: General 2-wire topology ......................................................................................................8

Figure 4: One segment with MODBUS master .................................................................................. 9

Figure 5: One segment with the MODBUS master at the end of the line .......................................... 9

Figure 6: Two MODBUS segments with use of a repeater; example 1 .............................................. 9

Figure 7: Two MODBUS segments with use of a repeater; example 2 ............................................ 10

Figure 8: Two MODBUS segments with use of a repeater; example 3 ............................................ 10

Figure 9: Example of built-in bias resistors ......................................................................................12

Figure 10: MRP21-FBP, connector pin assignment ......................................................................... 13

Figure 11: MODBUS round cable wire assignment .......................................................................... 14Figure 12: Feed-in 24V DC for FieldBusPlugs ..................................................................................15

Figure 13: Connecting shielded cables ............................................................................................ 16

Figure 14: Principle shielding of the MODBUS FieldBusPlugs ........................................................ 17

Figure 15: Connecting several FieldBusPlugs on the MODBUS network ........................................ 18

Figure 16: Connecting the MODBUS master via RS-232 to RS-485 converters ............................. 18

Figure 17: Connecting the 07KT98 COM1 via RS-232 to RS-485 converters ................................. 19

Figure 19: Example of an application overview for the use of several devices ................................ 43

Figure 20: Example of an application program for one device Part 1 .............................................. 44

Figure 21: Example of an application program for one device Part 2 .............................................. 45Figure 22: Example of an application program for one device Part 3 .............................................. 46



Figure 25: Indicators and operating elements on the front plate .....................................................49

Figure 26: MRP21-FBP, mechanical dimensions ............................................................................. 53

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Introduction

Terminology

Introduction to MODBUS FieldBusPlug

Terminology

RTU MODBUS Remote Terminal Unit transmission mode

PDU Protocol Data Unit

PLC Programmable Logic Controller

CRC Cyclical Redundancy Check

LED Light-Emitting Diode

FBP Field Bus Plug (FieldBusPlug)

MRP MODBUS RTU FieldBusPlug

MSD Motor Starter Direct

MSR Motor Starter ReverseMFI Motor Starter Fieldbus Interface

UMC Universal Motor Controller

LB Low Byte in a 16-bit word.

HB High Byte in a 16-bit word.

0xyyyy 0x defines that the number yyyy is a hexadecimal value

Definition of the terms input and output

An output is a data value sent to a MODBUS slave and an input is a monitoring valuegenerated by the same MODBUS slave.

The MODBUS FieldBusPlug MRP21-FBP establishes the field bus connection between the MODBUS

and the terminal devices connected to this bus. The MODBUS FieldBusPlugs are slaves (nodes) on the

MODBUS network.The terminal devices must have the field bus-neutral interface (e.g. as provided by the ABB FBP modules

MSD11-FBP, MSR22-FBP, MFI21-FBP and UMC22-FBP).

MODBUS bus plug of the next FieldBusPlug

Fieldbus-neutral interface

to the terminal device

MODBUS bus plug to theprevious FieldBusPlug or to

the bus master

Figure 1: MODBUS FieldBusPlug

Introduction to MODBUS FieldBusPlug

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The data exchange between the MODBUS FieldBusPlug and the terminal device can be performed in two

ways:

Parallel communication

The signals are exchanged directly via the connections of the field bus-neutral interface.Scope of data: max. 1 digital output (1 control signal to terminal device) plus 2 digital inputs

(2 feedback signals from terminal device). If the FieldBusPlug does not receive any telegram

from the terminal device during power-on, this mode of data exchange will be set.

Serial communicationThe signals are exchanged with the help of a serial data protocol via the field bus-neutral

interface. Binary, analog, parameter and diagnostic data is sent and received. As soon as the

FieldBusPlug receives a valid telegram from the terminal device, this mode of data exchange

will be set non-volatile.

The MODBUS FieldBusPlug MRP21-FBP behaves as an input/output module on the MODBUS.

During the initialization phase, the plug receives the device-specific (configuration) data from the terminal

device. This data is equal to the corresponding data in the bus master, provided that the correct terminal

device was selected there.

During start-up, an optional configuration data may be transferred from the bus master to the plug. To

make sure that the right serial device is connected.

To make sure, that the bus master can access the slaves connected to the bus line, a setting of the slaveaddresses is always necessary. Generally and over the full address range, the CAS21-FBP addressing set

can be used. But it is easier, if the terminal device has address setting switches or similar means for the

address setting. In this case, the FieldBusPlug adopts the address from the terminal device during power-

on.

Once the address is set, it is stored in the FieldBusPlug, even in case of supply voltage breakdown.

According to the MODBUS standard, the addresses 1 to 247 can be set. The address 0 is reservedand should not be used for slaves.

For diagnosis purposes, the MODBUS FieldBusPlugs are equipped with four LEDs (see Figure 25: Indica-

tors and operating elements on the front plate).

In addition to the two signal cores, the MODBUS cable contains two cores for 24 V. This voltage is always

necessary for supplying the FieldBusPlugs. The voltage can be fed-in at the bus master, for example.

Caution:

False polarity or reversal between bus lines and power supply lines can cause a destruction of the Field-

BusPlug.

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Supplying the terminal devicescan be selected as follows:

Internal supply(switch position INT): The terminal device is powered from the bus cable, too.

External supply(switch position EXT):

The terminal device is powered by a remote power supply. This is necessary, if the current

consumption is high or if there are components installed to the terminal device, which are not

nearby, e.g. proximity switches. There is an electrical isolation between the MODBUS signals

and the field bus neutral interface.

MODBUS data overview

* The Configuration frame is optional, with this frame can be checked whether the

correct device is connected.

** Contains configuration, identification and other data.

*** Configuration data start with 0x4028.

Group Type / remark Qty. / Presentation

on t he MODBUS

Starting

Address

Direction MODBUS

Function

Code

Cyclic

data

Monitored signals

(inputs)

DI = digital input

serial device

0 256 bits 0x0000 read 1, 2

DI = digital input

parallel device

2 bits 0x1000

AI = analog input

serial device

0 125 words 0x0200 read 3, 4

Commands

(outputs)

DO = digital output

serial device

0 256 bits 0x0100 write 15

DO = digital output

parallel device

1 bit 0x1100

AO = analog output

serial device

0 125 words 0x0300 write 16

Acyclic

data

from

/ to

device

Diagnosis Faults and warnings free block length

0 8 words

0x2000 read 3, 4

Param-

eters

block Control function

trip class ...

range 0 - 120 words,

qty. defined by device

0x3000 write 16

single not possible - - - -

Configuration * qty. of DI, DO,

parameters,

fixed block 7 words 0x4050 write 16

Configuration **,Identification,others

dto.+ productcode..,baud rate

free block length0 51 words

0x4000***

read 3, 4Acyclicdata,notfrom/ todevice

Set baud rate optional 1 word 0x4064 write 16

Return query data optional,

life monitoring

Function code 08,

Sub code 00

- 08,

Sub code

00

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Hardware installation guide

Bus topology

MODBUS physical communication layer

FieldBusPlug connector pin assignment

Powering the FieldBusPlugs

Connecting several FieldBusPlugs on the MODBUS network

Connecting the MODBUS master via RS-232 to RS-485 converters

MODBUS round cable, one cable end without plug

Bus topology

General overview

The figure below gives a general overview of the serial bus infrastructure in a MODBUS multipoint serial

line system.

Two-wire MODBUS topology

A MODBUS solution over serial line is based on a Two-wire electrical interface in accordancewith EIA/TIA-485.

Figure 3: General 2-wire topology

Line Terminator Line Terminator

Slave 1 Slave 2

Master

5 V

B (D1)

A (D0)

Common

Pull Up / bias resistor

Pull Down / bias resistor

Figure 2: Principle serial bus infrastructure

MODBUS RTU

master

Line Terminator Line Terminator

trunk cable

Active tap

Passive

tap

drop cable

Slave 1 Slave 2

Slave n

LTLTRS-485

The use of passive bus

stub lines shoud be

avoided. The use of

repeaters and active taps

is recommended.

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Examples of MODBUS installations without segmentation

Segmenting of MODBUS installation

The following figure illustrates the segmenting of an example MODBUS installation which uses

a repeater.

LT LT

S

M

S S S S

Figure 4: One segment with MODBUS master

LT: Line TerminatorM: MODBUS RTU Master

S: MODBUS Slave

LT

S

M

S S S SLT

Figure 5: One segment with master at the end of the line

LT: Line Terminator

M: MODBUS RTU Master

S: MODBUS Slave

LT

S

M

S S S SLT

R

LT LT

Figure 6: Example 1,

two MODBUS segments with use of a repeater

LT: Line Terminator

M: MODBUS RTU MasterS: MODBUS Slave

R: Repeater

Segment 1 Segment 2

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There are two more figures which illustrate the segmenting of an example MODBUS installation

using a repeater.

Figure 7: Example 2,two MODBUS segments with use of a repeater

LT: Line Terminator


S: MODBUS Slave

R: Repeater

LT

S

M

S

S S S

LT

R

LT

S S

LT

Segment 1

Segment 2

LT

S

M

S

S S S

LT

R

LT

S S

LT

S S

Segment 1

Segment 2

Figure 8: Example 3,

two MODBUS segments with use of a repeater

LT: Line Terminator

M: MODBUS RTU MasterS: MODBUS Slave

R: Repeater

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MODBUS physical communication layer

Physical communication layer

At the physical level, the RS-485 (TIA/EIA-485) two-wire interface is used. This allows point to point and

multipoint systems.

Maximum number of devices on a bus segment

Each bus segment can have a maximum of 32 active devices.

MODBUS RTU master

MODBUS slave

Repeater

In order to be able to connect a larger number of MODBUS devices, a repeater is used. Repeaters inter-

connect the bus segments and refresh the data signals. Each repeater also allows to extend the maxi-mum admissible cable length. Repeaters increase the signal propagation delay times, therefore a maxi-

mum of fourrepeaters are allowed between any two stations.

Length

Trunk cable:

The end-to-end length of the trunk cable is limited. The maximum length is 1000m.

The bus length can be extended with repeaters (max. 4 repeaters in series).

Drop cable:

The use of passive bus stub lines should be avoided. The use of repeaters and active taps

is recommended.

Line Termination

Termination resistors should be placed only at the ends of the bus line, and no more than

2 terminations should be placed in any system that does not use repeaters.

A switchable (on/off) terminal resistor (and bias resistors) are normally placed in:

MODBUS master

Repeater

RS-232 to RS-485 converter (see Figure 9)

The terminal resistor DNR11-FBP.120 can be used (see Accessories) if the device at the end of the line

has no built-in terminal resistor.

DNR11-FBP.120 Pin assignment

Pin 4

Pin 5

120Ohm

Pins 1- 3 = unused

male

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Biasing the line

When an RS-485 bus is in an idle state, all devices are in listen (receive) mode. Without anything driving

the bus, the state of the line is unknown. In order to maintain a proper idle voltage state, bias resistors

must be appliedto force the data lines to the idle condition. Bias resistors are a pull-up resistor on thedata B line (typically to 5V) and a pull-down (to ground) on the data A line.

Bias resistors are normally placed in:

MODBUS master

Repeater

RS232 to RS485 converter

The MODBUS FieldBusPlug MRP21-FBP has build-in bias resistors of 22 k each.

Fail save biasing of the bus

The sum of all bias resistors, from the data B line typically to 5V respectively from the data A line to

ground, in a bus segment shall be 750 .

Example 1:

Mounting 31 FieldBusPlugs in a MODBUS segment the sum of the bias resistors is ~ 710

In that case no additional bias resistors are necessary.

Example 2:

Mounting 5 FieldBusPlugs in a MODBUS segment the sum of the bias resistors is 4400 .

One pair of bias resistors are additionally necessary. Normally switch in bias resistors are

placed in MODBUS master, repeater or RS-232 to RS-485 converter.

line terminator

5 V

Common

bias resistor

bias resistor

Figure 9: Example of built-in bias resistors

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FieldBusPlug connector pin assignment

The connector pin assignment of the FieldBusPlugs for the MODBUS interface (plug at the cable end and bus interface to the next FieldBusPlug)

the field bus-neutral interface to the terminal device

Figure 10: MRP21-FBP, connector pin assignment

Pins

MODBUS bus plug at the

cable end, to previous Field-

BusPlug or to bus master

Sockets

MODBUS bus plug of

the next FieldBusPlug

Pin assignment:

1 Shield

2 +24 V DC

3 0 V DC

4 B/B' (D1) TXD1/RXD1 5 A/A' (D0) TXD0/RXD0

MODBUS bus interface.

Here, the MODBUS bus cable

plug of the next FieldBusPlug isplugged in.

If compliance with IP 65 regula-tions is required, this interface

must be sealed by a cap on the

last FieldBusPlug (at the end ofthe MODBUS bus). This cap is

provided with the FieldBusPlug.

Sockets

View from

the leftField bus-neutral interface to

the terminal device

Pin assignment for parallel mode:

1 +24 V

2 digital input (DI 1)

3 0 V

4 digital input (DI 0)

5 digital output (DO 0)

Pin assignment for serial mode:

1 +24 V

2 Diagnosis pin

3 0 V4 Serial data

5 Serial data

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MODBUS round cable, one cable end without plug

Powering the FieldBusPlugs and the devices

Supply INT / EXT

The supply of the FieldBusPlug is always made via the bus cable. This enables the FieldBusPlug to mo-nitor the actual -e.g. faulty- status to the control station even when it is removed from the device or when

power down appears on the device.

With the switch EXT/INT set to EXT or the equivalent wiring on the device the supply is limited to the

FieldBusPlug.

As an exception even some devices can be supplied via the bus. In this case the switch has to be set to

position INT.

But normally the devices connected to the MODBUS are intelligent and have, therefore, inputs which are

normally not insulated from the device supply. And these inputs can be connected to distant components

such as push buttons or limit switches.

This means, with the supply of the devices via the bus a widely branched supply network would arise

which cannot be surveyed and where a short circuit on an external component or lead wire paralyses the

complete bus communication.

The loss of voltage bridging time from the FieldBusPlug is 1ms. Therefore the 24 V DC power supplyshall have a loss of voltage bridging time of 10ms.

To be noticed

Use separate supply units or separately fused supply circuits for the FieldBusPlug line and the

devices.

Use the INT position of the INT/EXT switch only during commissioning of single devices and only

if inevitable.

On the installation site use the INT position only for simple devices such as proximity switches or

MSD11-FBP / MSR22-FBP. In this case also check the supply situation / voltage drops carefully.

Check carefully whether the switches of the devices are set to EXT before delivering to the in-

stallation site.

Check the supply situation. Dont forget to check the total bus length.

Shield bare flexible lead

+24V DC red

0V DC black

B/B (D1) white

A/A (D0) blue

Figure 11: MODBUS round cable wire assignment

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Feed-in 24 V DC if the bus cable is long

If the distance between the bus master and the slaves is longer, it may be necessary to feed-in

24 V DC for the FieldBusPlugs on a second place.

All slaves, also the most distant slave from the supply, need to be supplied with min. 19.2 V DCincluding ripple. That means that the power supply unit has to provide a higher voltage to compensate

the voltage drops due to the l ine resistance.

Figure 12: Feed-in 24 V DC for FieldBusPlugs

Master

24 V

0 V

MODBUS

24 V

DC

A

B

24V 0V

FBP SlaveBus master

DNM11-FBP.050

round cable, male plug at-

tached at one end, 0.5 m,

sheath partially rfemoved, wire-end ferrules attached

FBP Slave FBP Slave

connected

shield

DNM11-FBP.050

round cable withmale plug

DNF11-FBP.050

round cable withfemale plug

Feed-in 24 V DC for

FieldBusPlugs

Plant specific configuration

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Shielding

A shielded cable provides good protection against electromagnetic interference, particularly high frequen-

cies. The effectiveness of a shielded cable depends on how it is installed.

Connecting shielded cables

Figure 13: Connecting shielded cables

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Principle shielding of the MODBUS FieldBusPlugs

Figure 14: Principle shielding of the MODBUS FieldBusPlugs

Earth

Ground

FieldBusPlug

(shield is internal

connected through)

Potential

equalization

MODBUS

master

24 V

DC

24 V

DC

LT

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Connecting several FieldBusPlugs on the MODBUS network

Figure 15: Connecting several FieldBusPlugs on the MODBUS network

Connecting the MODBUS master via RS-232 to RS-485 converters

Always use isolated converters!

Use the types that enables the RS-485 transmitter by detecting a transmit signal on the RS-232line (automatic controlled).

It is important to note that the RS-485 transmit data line is disabled at a fixed interval after the last

bit, typically one character length.

Has the converter a pull-up and pull-down resistor included?

Check that the termination resistor corresponds with the line impedance.

LTM

S S S SLT

RS-232 RS-485

LT: Line Terminator


S: MODBUS Slave

R: Repeater

Figure 16: Connecting the MODBUS master via RS-232 to RS-485 converters

isolated

converter

The figure below shows how to connect the MODBUS master via RS-232 to RS-485 converters.

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How to connect the MODBUS FieldBusPlug on AC31 basic unit

The figure below shows how to connect the AC31 basic unit (e.g. 07KT97 / 07KT98)

via COM1 or COM2 (RS-232) to MODBUS network.

LT

S S S SLT

RS-232

C

O

M

1

C

O

M

2

07 KT 98RS-485

LT: Line Terminator


S: MODBUS Slave

R: Repeater

Figure 17: Connecting the 07KT98 COM1 via RS-232 to RS-485 converters

isolated converter

automatic controlled

(no RTS necesarry)

The 07KT98 is configured as MODBUS master; the communication interface is - in this example - COM1

(RS-232).

The MODBUS RTU protocol is used, therefore a RS-232 to RS-485 converter must be connected

between the 07KT98 and the MODBUS network.

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MODBUS master slave communication

Important warning

It is of great importance to ensure, that all of the devices have a different address.Otherwise the serial bus can show an abnormal behaviour and the master is not able to

communicate with all of the present slaves on the bus.

Master Slave

Initate Reguest

Function code Data Request

Perform the action

Initiate the response

Function code Data Response

Receive the response

MODBUS transaction (error free)

Initate Reguest

Function code Data Request

Error detection in action

Initiate an error response

Exception Function code Data Response

Receive the response

MODBUS transaction (exeception response)

Master Slave

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MODBUS master communication parameters

For the MODBUS communication between the master and the FieldBusPlug several parameters have to

be set. The parameters and their settings are shown in the following table:

Notes for the MODBUS master

The following times have to be considered by the MODBUS master.

In RTU mode, message frames are separated by a silent interval of at least 3.5character times.

The start of a new telegram is expected if the silent interval is > 3.5 character times.

How to set the slave address

The FieldBusPlug has the slave address 248 after distribution. In this case it is not possible to

communicate with the FieldBusPlug via MODBUS.

To make sure, that the bus master can access the slaves connected to the bus line, a setting of the slaveaddresses is always necessary. Generally and over the full address range, the CAS21-FBP addressing set

can be used. But it is easier, if the terminal device has address setting switches or similar means for the

address setting. In this case, the FieldBusPlug adopts the address from the terminal device during power-

on.


According to the MODBUS standard, the addresses 1 to 247 can be set. The address 0 is reserved andshould not be used for slaves.

Serial communication parameters Start bit 1 1

Data bits 8 8

Parity (see *1) Even/Odd No

Stop bit 1 2

Baud rate 1200

2400

4800

9600

19200 57600

*1: There is no parity setting on the FieldBusPlug necessary

Serial Transmission code RTU (11 bits/character)

Baud rate silent interval

3.5 character 4 character times times

1200 32.08 ms 36.67 ms

2400 16.04 ms 18.33 ms

4800 8.02 ms 9.17 ms

9600 4.01 ms 4.58 ms

19200 2.01 ms 2.29 ms

57600 1.75 ms recommended to use

1 character = 1 stop bit + 8 data bit + 1 parity bit +1 stop bit

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Default baud rate mapping via device address

During start-up phase the following baud rates are adjusted

Note:

An other baud rate can be chosen during commissioning via MODBUS, seechapter Set baud rate via MODBUS.

How to adjust the parity and the stop bit on the FieldBusPlugThere is no parity and stop bit setting on the FieldBusPlug necessary.

Communication protocol

The following commands are implemented

Commands MODBUS Function Codes Starting

address

Set baud rate via MODBUS FC 16 Write Multiple Registers 4064 Hex

Write configuration data FC 16 Write Multiple Registers 4050 Hex

Write parameter data FC 16 Write Multiple Registers 3000 Hex

Read binary input values serial device FC 1 Read Coils

FC 2 Read Discrete Inputs

0000 Hex

Read binary input values parallel device FC 1 Read Coils

FC 2 Read Discrete Inputs

1000 Hex

Write binary output values serial device FC 15 Write Multiple Coils 0100 Hex

Write binary output values parallel device FC 15 Write Multiple Coils 1100 Hex

Read analog input values serial device FC 3 Read Holding RegistersFC 4 Read Input Registers

0200 Hex

Write analog output valuesserial device FC 16 Write Multiple Registers 0300 Hex

Read diagnostic data FC 3 Read Holding Registers

FC 4 Read Input Registers

2000 Hex

Read additional data FC 3 Read Holding Registers

FC 4 Read Input Registers

4000 Hex

Return query data FC 8 Sub Function 00

Amount of process data

Commands Maximum amount of data,

depends on the terminal device

Write parameter data 120 Words

Read binary input values 256 Bits

Write binary output values 256 Bits

Read analog input values 125 Words

Write analog output values 125 Words

Read diagnostic data 16 Bytes

Device address Baud ratebits/s

1 to 32 9600

33 to 65 19200

66 to 98 57600

99 to 247 19200

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Set baud rate via MODBUS

The MODBUS function code 16 Write Multiple Registers is used.

Request

MODBUS function code 1 Byte 0x10

Starting Address 2 Bytes 0x4064

Quantity of Registers 2 Bytes 0x0001

Byte Count 1 Byte 0x0002

Register Value 2 Bytes Baud rate

Response




Error Response

Error code 1 Byte 0x90

Exception code 1 Byte 01 or 02 or 03 or 04

MODBUS frame over the serial line

* depends on the device

Request

1 Byte 1 Byte 2 Bytes 2 Bytes 1 Byte Word 0 2 Bytes

Slave Function Starting Quantity Byte Baud rate CRC

Address Code Address of Registers Count

* 0x10 0x4064 0x0001 0x02 e.g. 0x4B00 (19200dec)

1 Byte 1 Byte 2 Bytes 2 Bytes 2 Bytes

Slave Function Starting Quantity CRC

Address Code Address of Registers

* 0x10 0x4064 0x0001


Response

Baud rate

High byte Low byte

Word 0

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Reading the Baudrate via MODBUS

It is possible to use the MODBUS function codes 3 Read Holding Registers or 4 Read Input Registers

Request

MODBUS-Functioncode 1 Byte 0x03 or 0x04

Startaddress 2 Bytes 0x4064

No Registers 2 Bytes 0x0001

Response


Startaddress 1 Bytes 2No Registers 2 Bytes

N* = Anzahl Eingangsregister

Response in case of a fault

Errorcode 1 Byte 0x83 or 0x84

Errorcode (Exception Code) 1 Bytes 01 or 02 or 03 or 04

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Write configuration data

During the initialization phase, the plug receives the device-specific (configuration) data from the terminal

device. This data is equal to the corresponding data in the bus master, provided that the correct terminal

device was selected there.

During start-up, an optional configuration data may be transferred from the bus master to the plug


Request


Starting Address 2 Bytes 0x4050 see note 1)


Byte Count 1 Byte 0x0E

Register Value 14 Bytes Device configuration data

Error Response



Response




Note 1)Against the MODBUS specification it is not possible to write values with an address offset.



Request

1 Byte 1 Byte 2 Bytes 2 Bytes 1 Byte Word 0 ... Word 6 2 Bytes

Slave Function Starting Quantity Byte Device configuration data CRC


* 0x10 0x4050 0x0007 0x0E *



Address Code Address of Registers

* 0x10 0x4050 0x0007


Response

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V 6

Device configuration data

Word 0, high byte Number of binary inputs 0 256 depends on the device

Word 0, low byte Number of binary outputs 0 256 depends on the device

Word 1, high byte Number of analog inputs 0 125 depends on the device

Word 1, low byte Number of analog outputs 0 125 depends on the device

Word 2 Number of parameter 0 120 depends on the device

Word 3, high byte Number of diagnostic bytes 0 16 depends on the device

Word 3, low byte 0x00; Not used

Word 4 Sum of all parameter bytes 0 240

Word 5 Device Product Code depends on the device

Word 6 MODBUS bus timeout 0x0000 no timeout

0x00010x1FFF

Unit is: ms *1)

*1) see chapter MODBUS bus timeout

High byte Low byte

Word 0 Word 1 Word 2 Word 3 Word 4 Word 5 Word 6

Reading configuration data

Use the MODBUS-Functioncodes 3 Read Holding Registers or 4 Read Input Registers.

Request


Start address 2 Bytes 0x4050

No. Register 2 Bytes 0x0007

Reply

MODBUS-Functioncode 1 Byte 0x03 oder 0x04

Start address 1 Bytes 0x0E

Input registers 14 Bytes Configuration data

Reply on error

Error code 1 Byte 0x83 or 0x84

Error code (Exception Code) 1 Bytes 01 or 02 or 03 or 04

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V 6

Write parameter data




Request

1 Byte 1 Byte 2 Bytes 2 Bytes 1 Byte Word 0 ... Word N 2 Bytes

Slave Function Starting Quantity Byte Device parameter data CRC


* 0x10 0x3000 * * *


Slave Function Starting Quantity CRCAddress Code Address of Registers

* 0x10 0x3000 *


Response

Error Response



Response


Starting Address 2 Bytes 0x3000 Quantity of Registers 2 Bytes 2xN*

N* = quantity of registers

Request


Starting Address 2 Bytes 0x3000 see note 1)

Quantity of Registers 2 Bytes 0x0001 to 0x0078

Byte Count 1 Byte 2xN*

Register Value N*x2 Bytes Device parameter data

N* = quantity of registers

Note 1)

Against the MODBUS specification, it is not possible to write values with an address offset.

Device parameter data

High byte Low byte

Word 0 Word 1 Word 2 Word 3 Word 4 ... Word N

N

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V 6

Read binary input values (parallel device)

The MODBUS function code 1 Read Coils or function code 2 Read Discrete Inputs could be used.

Device binary input data

Byte 0

Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0


Request


Slave Function Starting Quantity of CRC

Address Code Address Coils / Inputs

* 0x01 or 0x1000 *

0x02


1 Byte 1 Byte 1 Byte Byte 0 ... Byte n 2 Bytes

Slave Function Byte Binary input data from CRC

Address Code count device

* 0x10 or * *

0x02


Response

Error Response



Response

MODBUS function code 1 Byte 0x01 or 0x02

Byte count 1 Byte N*

Coil / Input status n Bytes n = N or N+1

N* = Quantity of Inputs / 8, if the remainder is different of 0 N = N+1


Starting Address 2 Bytes 0x1000 ... 0x1007

Quantity of Coils / Inputs 2 Bytes 0x00010x0008 (8 inputs))

depends on the device

Request

Note: If a serial device is connected an error response appears

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Write binary output values (serial device)

The MODBUS function code 15 "Write Multiple Coils" is used.

Device binary output data

Byte 0


Byte 1


Byte 2


Byte 0 Byte 1 Byte 2 ... ... ... Byte n

MODBUS function code 1 Byte 0x0F

Starting Address 2 Bytes 0x0100 ... 0x01FF

Quantity of Coils / Outputs 2 Bytes 0x0001 ... 0x0100 (256 outputs)


Byte Count 1 Byte N*

Output Value N* x1 Byte

N* = Quantity of Outputs / 8, if the remainder is different of 0 N = N+1

Request

Error Response

Error code 1 Byte 0x8F



Starting address 2 Bytes 0x0100 ... 0x017F Quantity of Coils / Outputs 2 Bytes 0x0001 ... 0x0100 (256 inputs)


Response



Request

1 Byte 1 Byte 2 Bytes 2 Bytes 1 Byte Byte 0 ... Byte n 2 Bytes

Slave Function Starting Quantity Byte Device binary output data CRC

Address Code Address of Outputs Count

* 0x0F 0x0100 * * *



Address Code Address of Outputs

* 0x0F 0x0100 *


Response

Note: If a parallel device is connected an error response appears

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V 6

Read binary output values (serial device)

Use the MODBUS functions 1 Read Coils or 2 Read Discrete Inputs.

Request

MODBUS-Funktioncode 1 Byte 0x01 or 0x02

Startaddress 2 Bytes 0x0100 ... 0x01FF

No. Register 2 Bytes 0x00010x0100 (256 Outputs)depends of the device

Response

MODBUS-Funktioncode 1 Byte 0x01 or 0x02

Startaddress 1 Bytes N*

No. Register 14 Bytes n = N or N+1N* = No. of inputs / 8, if division rest is different from 0 N = N+1

Response in case of an error



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V 6

Write binary output values (parallel device)

The MODBUS function code 15 "Write Multiple Coils" is used.



Quantity of Coils / Outputs 2 Bytes 0x0001 ... 0x0008 (8 outputs)


Byte Count 1 Byte N*

Output Value N* x1 Byte

N* = Quantity of Outputs / 8, if the remainder is different of 0 N = N+1

Request

Error Response

Error code 1 Byte 0x8F



Starting address 2 Bytes 0x1100 ... 0x1107 Quantity of Coils / Outputs 2 Bytes 0x0001 ... 0x0008 (8 inputs)


Response



Request

1 Byte 1 Byte 2 Bytes 2 Bytes 1 Byte Byte 0 ... Byte n 2 Bytes

Slave Function Starting Quantity Byte Device binary output data CRC


* 0x0F 0x1100 * * *


Slave Function Starting Quantity CRCAddress Code Address of Outputs

* 0x0F 0x1100 *


Response

Note: If a serial device is connected an error response appears

Device binary input data

Byte 0


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V 6

Read analog input values

The MODBUS function code 3 Read Holding Registers or function code 4 Read Input Registers could

be used.


Request 1 Byte 1 Byte 2 Bytes 2 Bytes 2 Bytes


Address Code Address Registers

* 0x03 or 0x0200 *

0x04


1 Byte 1 Byte 1 Byte Word 0 ... Word N 2 Bytes

Slave Function Byte Analog input data from CRC


* 0x03 or * * 0x04


Response

Error Response



Response


Byte count 1 Byte 2 x N*

Input Register N*x 2 Bytes

N* = Quantity of Input Registers

Request


Starting Address 2 Bytes 0x0200 ... 0x027C

Quantity of Input Registers 2 Bytes 0x0001 ... 0x007D


Device analog input data

High byte Low byte


N

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V 6


Starting Address 2 Bytes 0x0300 ... 0x037C

Quantity of Outputs 2 Bytes 0x0001 ... 0x007D


Byte Count 1 Byte 2 x N*

Output Value N*x 2 BytesN* = Quantity of Registers

Request

Write analog output values

The MODBUS function code 16 "Write Multiple Registers" is used.

Error Response





Request

1 Byte 1 Byte 2 Bytes 2 Bytes 1 Byte Word 0 ... Word N 2 Bytes

Slave Function Starting Quantity Byte Device analog output data CRC


* 0x10 0x0300 * * *


Slave Function Starting Quantity CRCAddress Code Address of Outputs

* 0x10 0x0300 *


Response


Byte count 2 Bytes 0x0300 ... 0x037C

Quantity of Outputs 2 Bytes 0x0001 ... 0x007D

Response

Device analog output data

High byte Low byte


N

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V 6

Read analog output values (serial device)

Use the MODBUS functions 3 Read Holding Registers or 4 Read Input Registers.

Request


Startaddress 2 Bytes 0x0200 ... 0x027C

No. Register 2 Bytes 0x00010x007D (depends of device)

Response


Startaddress 1 Bytes 2 x N*

No. Register N* x 2 Bytes

N* = No. of input registers

Response in case of an error



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V 6

Read diagnostic data


be used.


Request 1 Byte 1 Byte 2 Bytes 2 Bytes 2 Bytes



* 0x03 or 0x2000 *

0x04



Slave Function Byte Diagnostic data from CRC


* 0x03 or n * 0x04


Response

Error Response



Response





Request

Device diagnostic data

HB: High byte / LB: Low byte



Quantity of Input Registers 2 Bytes 0x0001 ... 0x0008


Word 0 Word 1 Word 2 Word 3

HB LB HB LB HB LB HB LB

Diag.

Byte 1

Diag.

Byte 0

Diag.

Byte 3

Diag.

Byte 2

Diag.

Byte 5

Diag.

Byte 4

Diag.

Byte 7

Diag.

Byte 6

Word 4 Word 5 Word 6 Word 7

HB LB HB LB HB LB HB LB

Diag.

Byte 9

Diag.

Byte 8

Diag.

Byte 11

Diag.

Byte 10

Diag.

Byte 13

Diag.

Byte 12

Diag.

Byte 15

Diag.

Byte 14

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V 6

Read additional data


be used.


Request




* 0x03 or 0x4000 *

0x04



Slave Function Byte Additional data CRC

Address Code count

* 0x03 or *

0x04


Response

Error Response



Response





Request



Quantity of Input Registers 2 Bytes 0x0001 ... 0x0033


Additional data

High byte Low byte


By using this Request it is possible to define an address offset.

Example: Starting Address = 0x4028

Quantity of Registers = 0x000B

Verification: Starting Address + Quantity of Registers

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V 6

Address Amount of data Description

0x4000 2 words Vendor name MODBUS FieldBusPlug

0x4002 6 words Product code device information

0x4008 2 words Major.Minor Revision

0x400A 6 words Vendor URL

0x4010 8 words Product Name

0x4018 8 words Not used

0x4020 8 words Not used

0x4028 7 words see chapter Write Device configuration data

configuration to the Device

0x402F 1 word MODBUS CRC-Error count MODBUS specific data

0x4030 1 word MODBUS Request Slave

Exception Error Count

0x4031 1 word MODBUS slave address

0x4032 1 word MODBUS baud rate unit is (baud rate / 100) e.g. 192 == 19200 baud

Return query data

The MODBUS function code 8 sub fucntion 00 could be used in the configuration and data exchange

mode of the FielBusPlug.


Request


Slave Function Sub Data CRC

Address Code function

* 0x08 0x0000 **

* depends on the device ** User defined request data

Response

Error Response


Exception code 1 Byte 01

Request


Sub function 2 Bytes 0x0000

Data 2 Bytes User defined request data

Response


Slave Function Byte Data CRC

Address Code count* 0x08 0x0000 **

* depends on the device ** Echo request data


Sub function 2 Bytes 0x0000

Data 2 Bytes Echo request data

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V 6

Word 0, high byte Number of binary inputs 2

Word 0, low byte Number of binary outputs 1

Word 1, high byte Number of analog inputs 0

Word 1, low byte Number of analog outputs 0

Word 2 Number of parameter 0

Word 3, high byte Number of diagnostic bytes 0

Word 3, low byte 0x00; Not used 0

Word 4 Sum of all parameter bytes 0

Word 5 Device Product Code 1

Word 6 MODBUS bus timeout 0x0000 no timeout0x0001 ... 0x1FFF

unit ist ms *1)

Note: It is impossible to detect whether a parallel device is connected, defect or missing.

High byte Low byte

Word 0 Word 1 Word 2 Word 3 Word 4 Word 5 Word 6

Use of devices without a communication protocol (parallel device)

Examples for devices with parallel communication are:

- sensor - pilot signal tower

- push button panels

Devices without a communication protocol are mapped with two binary input values and one binary out-

put value.

Supported requests

The following requests are supported for these devices:

Set baud rate via MODBUS

Write configuration data

Read binary input values (parallel device)

Write binary output values (parallel device) Read additional data

Optional device configuration data

For all devices without a communication protocol the following configuration data could be used.

Device address adjustment

These devices have no possibility to set a MODBUS slave address by hardware.

Therefore the Addressing Set CAS21-FBP.0 for PDP,DNP etc. can be used.

Order code: 1SAJ929003R0001


*1)see chapter MODBUS bus timeout

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V 6

MODBUS exception codes

Code Name Meaning

01 ILLEGAL FUNCTION The function code received in the request is not anallowable action for the slave.

It could also indicate that the slave is in the wrong

state to process a request of this type, for example

because it is not configured

02 ILLEGAL DATA ADDRESS The data address received in the request is not an

allowable address for the slave.

03 ILLEGAL DATA VALUE A value contained in the request data field is not an

allowable value for slave. This indicates a fault in the

structure of the remainder of a complex request, such

as that the implied length is incorrect.

04 SLAVE DEVICE FAILURE An unrecoverable error occurred while the slave was

attempting to perform the requested action.

- Wrong configuration

- Not supported baud rate

- Serial device connected, but parallel device

addressed

- Parallel device connected, but serial device

addressed

- Connected serial device defective

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V 6

How to build an application program

Application overview for the use of several devices

Setting up an application program for one device

Application overview for the use of several devices

Figure 19: Example of an application overview for the use of several devices

Start

Initialize the application

Initialize the serial interface for MODBUS Communication

Optional: Set baudrate

Optional : Write the device specific configuration data

Optional: Acyclic write all device specific parameter data

Read binary inputs form the device

Write binary outputs to the device

Read analog inputs form the device

Write analog outputs to the device

After N cycles, read diagnose data from the device

Handle the rest of the application progam

Device 1

Device ...

Device n

Device 1

Device ...

Device n

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V 6

Setting up an application program for one device

Figure 20: Example of an application overview for one device Part 1

Optional

Start

Initialize the application

Initialize the serial interface for MODBUS Communication

Yes

Yes

Is the MODBUS initialisation done ?

Is the serial interface

for MODBUS communication

ready for operation ?

Yes

Set flag: " MODBUS communication is initialized"

After Error Handling

Error

Write the new baudrate

Check the response telegram

Is the response telegram ok ?

Yes

Set flag: " baudrate setting is done"

Change the baudrate of the serial interface for MODBUS

Communication

1

Is the baudrate setting done ?

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V 6


2

cyclic data

exchange

Yes

Yes

Error


Read binary inputs from the device


Write binary outputs to the device


Copy the binary input values in the local memory


3

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V 6


4

Error

After Error Handling


Read diagnose data from the device


Copy diagnose data in the local memory

Yes

Yes

"N" cycles of data exchange done ?

after "N" cycles data exchange done ->read diagnose data from device

restart counter, next read diagnose after N cycles data exchange

increment counter, read diagnose after N cycles data exchange

Handle the rest of the application program

Plant specific error handling

cyclic data

exchange

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V 6

Meaning of the LEDs

Maintenance Indicators and operating elements on the front plate

What can go wrong?

Indicators and operating elements on the front plate

H1 and H2 display the network status

H3 and H4 display the module status

Fastening screw (provided on delivery)

Label for writing down the address

setting

Network status

Module status

Figure 25: Indicators and operating elements on the front plate

Network status Module status Status / Cause

LED green

H1

LED red

H2

LED green

H3

LED red

H4

off off off off Power supply is missing

flashes flashes flashes flashes Plug is under self-test

flashes off Plug is waiting for configuration data, to be sent from the termi-nal device (number of input/output bytes, number of parameterbytes, data rate etc.).

Note:If no data has been sent by the terminal device within 2 se-conds, the plug switches to the parallel mode.

on off The connection to the terminal device works properly.off flashes Error: can be remedied, e.g.

- terminal device defective or.

- connection to the terminal device is broken

off on Error: cannot be remedied, e.g. incorrect checksum in the flash,exchange plug

on flashes Plug works properly but

- no cyclic data exchange (no read/write of binary or ana-log data)

- or waiting for cyclic data exchange (no read/write of binaryor analog data) with MODBUS master, if the data ex-change with terminal device was broken before.

- MODBUS bus-timeout (if configured): No cyclic data ex-change between MODBUS master and the Plug.

Note:The MODBUS bus-timeout is only detected if a timeout is con-figured

on off Normal data exchange.

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V 6

What can go wrong?

RS485 Are the termination resistors placed at the end of the line?

Only 2 termination resistors in one segment?

Are 2 termination resistors placed at each bus segment?

Are bias resistors connected in each bus segment?

Is the line polarity correct? Are the lines by accident swapped?

Never place any termination resistors on a drop cable.

Is the maximum line length exceeded?

MODBUS parameters

Is the baud rate correctly adjusted?

Is the parity and the stop bit correctly adjusted?

Is the MODBUS master in RTU mode?

Is the slave address correct?

At start-up: The device baud rate is selected via the device address.

Are there two devices with the same address in the system? If yes, fix it!

MODBUS master

Is the request to response timeout correct?

Is the MODBUS silent interval between two telegrams > 3.5 character times?

Notice that the slave device will not give any response when it is addressed with a broadcast(slave address = 0).

MODBUS slave

Has the device an unique MODBUS address?

Is the function code supported by the device?

Has the request an valid address?

Has the request an valid quantity of coils, inputs, registers?

Is the power supply turned on for the FieldBusPlug?

Is the power supply turned on for the Terminal Device?

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V 6

Supply voltages

Standard power supply 24 V DC

FieldBusPlugs work correctly at supply voltage = 19.2 31.2 V DC

Current consumption

from the MODBUS power supply typ. 18.5 mA (24 V)

from the standard power supply Only the terminal device is supplied from the standard power supply unit.The terminal device may not load the standard power supply unit with

more than 200 mA.

Loss of voltage bridging time 1ms

Mounting on the terminal device, fixed with a screw (provided on delivery)or by M12 box nut fixing

Building of a MODBUS bus (or a segment) by connecting the FieldBusPlugs in series (first bus plug to coupler/master,

second bus plug to socket of the first FieldBusPlug, etc.)

Bus terminating resistors at both ends of the bus line 120 each

Build-in bias resistors Each MODBUS FieldBusPlug has:

- a pull-up resistor to a 5V Voltage on D1 circuit

- a pull-down resistor to the common circuit on D0

The value of the resistors are 22 k.

Bias resistors for the bus Fail save biasing of the bus.

The sum of all bias resistors in a bus segment shall be 750 .

Parallel connection of bias resistors from A+ -> 5V or B -> Common

shall be 750 in a bus segment.

Modes of data communication between

FieldBusPlug and terminal device parallel and serial

Scope of data according to MODBUS specifications

Construction of the FieldBusPlug cable round cable, black, 2 x 0.34 mm2for supply voltage

2 x 0.25 mm2for data lines

3 shields

Load capacity of plugs and cables max. 4 A

Pin assignment of the interfaces see Figure 10

Degree of protection

(see also Figure 10) IP 65, if M12 box nut fixing is used at the terminal device (e.g. sensor)

IP 20, if mounting is performed using the supplied fastening screw

(e.g. for MSD11-FBP)

Ambient temperature storage -20 ... + 70 C

operation 0 ... + 55 C

Dimensions see Figure 26

Total power dissipation of

the unit MRP21-FBP max. 0.525 W

Weight plug with cable 0.25 m 0.09 kg

plug with cable 0.5 m 0.10 kg

plug with cable 1 m 0.13 kg

plug with cable 5 m 0.35 kg

Bus address setting Over terminal Device, if the terminal device has address setting switches.

Or CAS21-FBP addressing set can be used.

Possible addresses 1 to 247 (0 is reserved)Diagnosis (see Figure 25) 4 LEDs on the front plate

LED green, LED red network status

LED green, LED red module status

Technical data

Technical data

Ordering data

Accessories

Mechanical dimensions

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V 6

Ordering data

A fastening screw, an address label and a terminal cap for the bus are supplied along

with the FieldBusPlug.

Type Description Order number

MRP21-FBP.025 MODBUS FieldBusPlug, cable length 0.25 m 1SAJ 250 000 R0003

MRP21-FBP.050 MODBUS FieldBusPlug, cable length 0.5 m 1SAJ 250 000 R0005

MRP21-FBP.100 MODBUS FieldBusPlug, cable length 1 m 1SAJ 250 000 R0010

MRP21-FBP.500 MODBUS FieldBusPlug, cable length 5 m 1SAJ 250 000 R0050

Accessories

The MODBUS accessories are the same as for DeviceNet. Therefore the DeviceNet order numbers and

descriptions may be used.

Type Description Order number

DNX11-FBP.100 DeviceNet extension cable, length 1 m 1SAJ 923 001 R0010



DNF11-FBP.050 DeviceNet round cable, female plug attached at 1SAJ 923 002 R0005

one end, 0.5 m, sheath partially removed,

wire-end ferrules attached

DNM11-FBP.050 DeviceNet round cable, male plug attached at 1SAJ 923 003 R0005

one end, 0.5 m, sheath partially removed, wire-end ferrules attached

DNC11-FBP.999 DeviceNet round cable on 100 m coil 1SAJ 923 004 R1000

DNM11-FBP.0 DeviceNet male connector for round cable 1SAJ 923 005 R0001

DNF11-FBP.0 DeviceNet female connector for round cable 1SAJ 923 006 R0001

DNR11-FBP.120 DeviceNet terminating resistor 1SAJ 923 007 R0001

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V 6

All dimensions in mm

Mechanical dimensions

Figure 26: MRP21-FBP, mechanical dimensions

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V 6

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